239.2.3.128/25
Multicast RFC 5771Class D (Multicast) — /25 prefix — 126 usable hosts
Network address — the base address of the block (239.2.3.128). All devices in this subnet share this prefix. Cannot be assigned to a host.
Broadcast address — packets sent to 239.2.3.255 are delivered to every device in the subnet. Also reserved — not assignable.
Usable hosts — the 126 addresses between those two that you can assign to servers, VMs, or interfaces.
Subnet mask — 255.255.255.128 is the dotted-decimal equivalent of /25. Older tools and Cisco configs use this format instead of CIDR slash notation.
Full Details
| CIDR Notation | 239.2.3.128/25 |
| Network Address | 239.2.3.128 |
| Broadcast Address | 239.2.3.255 |
| Subnet Mask | 255.255.255.128 |
| Wildcard Mask | 0.0.0.127 |
| Prefix Length | /25 |
| IP Address Class | Class D (Multicast) |
| Total IP Addresses | 128 |
| Usable Host Addresses | 126 |
| First Usable IP | 239.2.3.129 |
| Last Usable IP | 239.2.3.254 |
| Network (Hex) | 0xEF020380 |
| Broadcast (Hex) | 0xEF0203FF |
| Governing RFC | RFC 5771 |
| Address Type | Multicast |
Binary Representation
The first 25 bits (1s in the mask) identify the network. The remaining 7 bits identify hosts within the network.
Split into Equal Subnets
Split 239.2.3.128/25 into 2 equal /26 subnets (62 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 239.2.3.128/26 | 239.2.3.128 | 239.2.3.129 | 239.2.3.190 | 239.2.3.191 | 62 |
| 2 | 239.2.3.192/26 | 239.2.3.192 | 239.2.3.193 | 239.2.3.254 | 239.2.3.255 | 62 |
Split 239.2.3.128/25 into 4 equal /27 subnets (30 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 239.2.3.128/27 | 239.2.3.128 | 239.2.3.129 | 239.2.3.158 | 239.2.3.159 | 30 |
| 2 | 239.2.3.160/27 | 239.2.3.160 | 239.2.3.161 | 239.2.3.190 | 239.2.3.191 | 30 |
| 3 | 239.2.3.192/27 | 239.2.3.192 | 239.2.3.193 | 239.2.3.222 | 239.2.3.223 | 30 |
| 4 | 239.2.3.224/27 | 239.2.3.224 | 239.2.3.225 | 239.2.3.254 | 239.2.3.255 | 30 |
Split 239.2.3.128/25 into 8 equal /28 subnets (14 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 239.2.3.128/28 | 239.2.3.128 | 239.2.3.129 | 239.2.3.142 | 239.2.3.143 | 14 |
| 2 | 239.2.3.144/28 | 239.2.3.144 | 239.2.3.145 | 239.2.3.158 | 239.2.3.159 | 14 |
| 3 | 239.2.3.160/28 | 239.2.3.160 | 239.2.3.161 | 239.2.3.174 | 239.2.3.175 | 14 |
| 4 | 239.2.3.176/28 | 239.2.3.176 | 239.2.3.177 | 239.2.3.190 | 239.2.3.191 | 14 |
| 5 | 239.2.3.192/28 | 239.2.3.192 | 239.2.3.193 | 239.2.3.206 | 239.2.3.207 | 14 |
| 6 | 239.2.3.208/28 | 239.2.3.208 | 239.2.3.209 | 239.2.3.222 | 239.2.3.223 | 14 |
| 7 | 239.2.3.224/28 | 239.2.3.224 | 239.2.3.225 | 239.2.3.238 | 239.2.3.239 | 14 |
| 8 | 239.2.3.240/28 | 239.2.3.240 | 239.2.3.241 | 239.2.3.254 | 239.2.3.255 | 14 |
Split 239.2.3.128/25 into 16 equal /29 subnets (6 usable hosts each).
| # | CIDR | Network | First Usable | Last Usable | Broadcast | Hosts |
|---|---|---|---|---|---|---|
| 1 | 239.2.3.128/29 | 239.2.3.128 | 239.2.3.129 | 239.2.3.134 | 239.2.3.135 | 6 |
| 2 | 239.2.3.136/29 | 239.2.3.136 | 239.2.3.137 | 239.2.3.142 | 239.2.3.143 | 6 |
| 3 | 239.2.3.144/29 | 239.2.3.144 | 239.2.3.145 | 239.2.3.150 | 239.2.3.151 | 6 |
| 4 | 239.2.3.152/29 | 239.2.3.152 | 239.2.3.153 | 239.2.3.158 | 239.2.3.159 | 6 |
| 5 | 239.2.3.160/29 | 239.2.3.160 | 239.2.3.161 | 239.2.3.166 | 239.2.3.167 | 6 |
| 6 | 239.2.3.168/29 | 239.2.3.168 | 239.2.3.169 | 239.2.3.174 | 239.2.3.175 | 6 |
| 7 | 239.2.3.176/29 | 239.2.3.176 | 239.2.3.177 | 239.2.3.182 | 239.2.3.183 | 6 |
| 8 | 239.2.3.184/29 | 239.2.3.184 | 239.2.3.185 | 239.2.3.190 | 239.2.3.191 | 6 |
| 9 | 239.2.3.192/29 | 239.2.3.192 | 239.2.3.193 | 239.2.3.198 | 239.2.3.199 | 6 |
| 10 | 239.2.3.200/29 | 239.2.3.200 | 239.2.3.201 | 239.2.3.206 | 239.2.3.207 | 6 |
| 11 | 239.2.3.208/29 | 239.2.3.208 | 239.2.3.209 | 239.2.3.214 | 239.2.3.215 | 6 |
| 12 | 239.2.3.216/29 | 239.2.3.216 | 239.2.3.217 | 239.2.3.222 | 239.2.3.223 | 6 |
| 13 | 239.2.3.224/29 | 239.2.3.224 | 239.2.3.225 | 239.2.3.230 | 239.2.3.231 | 6 |
| 14 | 239.2.3.232/29 | 239.2.3.232 | 239.2.3.233 | 239.2.3.238 | 239.2.3.239 | 6 |
| 15 | 239.2.3.240/29 | 239.2.3.240 | 239.2.3.241 | 239.2.3.246 | 239.2.3.247 | 6 |
| 16 | 239.2.3.248/29 | 239.2.3.248 | 239.2.3.249 | 239.2.3.254 | 239.2.3.255 | 6 |
IP Address Sample
Showing first 16 of 128 total IPs.